He’s charged with fabricating a suicide bomb threat to frame his business rivals. But Brooklyn jeweler Rimon Alkatri spent a day on the witness stand in Manhattan yesterday insisting all he did was see something, then say something.

“If I say nothing, and God forbid something happen, I never forgive myself all my life,” Alkatri said of the May 2006, terror hot-line call that could put him behind bars for seven years.

Prosecutors say Alkatri was looking for revenge when he told a hot-line cop that his rivals, all of them fellow Syrian jewelers, were “five Arabic people that try to do something, like terrorist.” All five victims were subjected to repeated grillings, and cops with bomb-squad dogs trudged through their homes and workplaces, before they were cleared of suspicion.

Alkatri, who is free on $500,000 bail, is due back on the stand when the trial resumes Thursday.